Computer Science · GCSE
Everything Is a Number
A photograph, a song and the word 'hello' sit on the same disc. What do they have in common? The five data types the DfE names and why choosing one is a decision, with a figure that draws a one-dimensional array beside a two-dimensional one and puts the index under the box, never in it. Then binary and hexadecimal as one number written twice, with a place-value strip that sums its own bits to 106 and splits itself into the nibbles 6 and A. Then text, sound and graphics, with a bitmap small enough to count: the grid is the file, and the file size is multiplied out of the grid’s own dimensions. Three capacity formulae, a worked file-size calculation that ends by naming which convention it counted in, sixteen terms, and the misconceptions that cost marks.
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